source: trunk/athena/etc/xdm/xdm/protodpy.c @ 6052

/*
 * $XConsortium: protodpy.c,v 1.10 91/07/18 18:50:17 rws Exp $
 *
 * Copyright 1989 Massachusetts Institute of Technology
 *
 * Permission to use, copy, modify, distribute, and sell this software and its
 * documentation for any purpose is hereby granted without fee, provided that
 * the above copyright notice appear in all copies and that both that
 * copyright notice and this permission notice appear in supporting
 * documentation, and that the name of M.I.T. not be used in advertising or
 * publicity pertaining to distribution of the software without specific,
 * written prior permission.  M.I.T. makes no representations about the
 * suitability of this software for any purpose.  It is provided "as is"
 * without express or implied warranty.
 *
 * M.I.T. DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL M.I.T.
 * BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
 * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN 
 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 *
 * Author:  Keith Packard, MIT X Consortium
 */

/*
 * protodpy.c
 *
 * manage a collection of proto-displays.  These are displays for
 * which sessionID's have been generated, but no session has been
 * started.
 */

#include "dm.h"

#ifdef XDMCP

#include <sys/types.h>

static struct protoDisplay      *protoDisplays;

#ifdef DEBUG
static
PrintProtoDisplay (pdpy)
    struct protoDisplay *pdpy;
{
    Debug ("ProtoDisplay 0x%x\n", pdpy);
    Debug ("\taddress: ");
    PrintSockAddr (pdpy->address, pdpy->addrlen);
    Debug ("\tdate %d (%d from now)\n", pdpy->date, time(0) - pdpy->date);
    Debug ("\tdisplay Number %d\n", pdpy->displayNumber);
    Debug ("\tsessionID %d\n", pdpy->sessionID);
}
#endif

struct protoDisplay *
FindProtoDisplay (address, addrlen, displayNumber)
    XdmcpNetaddr    address;
    int             addrlen;
    CARD16          displayNumber;
{
    struct protoDisplay *pdpy;

    Debug ("FindProtoDisplay\n");
    for (pdpy = protoDisplays; pdpy; pdpy=pdpy->next)
    {
        if (pdpy->displayNumber == displayNumber &&
            addressEqual (address, addrlen, pdpy->address, pdpy->addrlen))
        {
            return pdpy;
        }
    }
    return (struct protoDisplay *) 0;
}

static
TimeoutProtoDisplays (now)
    long    now;
{
    struct protoDisplay *pdpy, *next;

    for (pdpy = protoDisplays; pdpy; pdpy = next)
    {
        next = pdpy->next;
        if (pdpy->date < now - PROTO_TIMEOUT)
            DisposeProtoDisplay (pdpy);
    }
}

struct protoDisplay *
NewProtoDisplay (address, addrlen, displayNumber,
                 connectionType, connectionAddress, sessionID)
    XdmcpNetaddr    address;
    int             addrlen;
    CARD16          displayNumber;
    CARD16          connectionType;
    ARRAY8Ptr       connectionAddress;
    CARD32          sessionID;
{
    struct protoDisplay *pdpy;
    long    date;

    Debug ("NewProtoDisplay\n");
    time (&date);
    TimeoutProtoDisplays (date);
    pdpy = (struct protoDisplay *) malloc (sizeof *pdpy);
    if (!pdpy)
        return NULL;
    pdpy->address = (XdmcpNetaddr) malloc (addrlen);
    if (!pdpy->address)
    {
        free ((char *) pdpy);
        return NULL;
    }
    pdpy->addrlen = addrlen;
    bcopy (address, pdpy->address, addrlen);
    pdpy->displayNumber = displayNumber;
    pdpy->connectionType = connectionType;
    pdpy->date = date;
    if (!XdmcpCopyARRAY8 (connectionAddress, &pdpy->connectionAddress))
    {
        free ((char *) pdpy->address);
        free ((char *) pdpy);
        return NULL;
    }
    pdpy->sessionID = sessionID;
    pdpy->fileAuthorization = (Xauth *) NULL;
    pdpy->xdmcpAuthorization = (Xauth *) NULL;
    pdpy->next = protoDisplays;
    protoDisplays = pdpy;
    return pdpy;
}

DisposeProtoDisplay (pdpy)
    struct protoDisplay *pdpy;
{
    struct protoDisplay *p, *prev;

    prev = 0;
    for (p = protoDisplays; p; p=p->next)
    {
        if (p == pdpy)
            break;
        prev = p;
    }
    if (!p)
        return;
    if (prev)
        prev->next = pdpy->next;
    else
        protoDisplays = pdpy->next;
    XdmcpDisposeARRAY8 (&pdpy->connectionAddress);
    if (pdpy->fileAuthorization)
        XauDisposeAuth (pdpy->fileAuthorization);
    if (pdpy->xdmcpAuthorization)
        XauDisposeAuth (pdpy->xdmcpAuthorization);
    free ((char *) pdpy->address);
    free ((char *) pdpy);
}

#endif /* XDMCP */